Another term for a woman's monthly friend, typically accompanied by unadulterated bitching, whining and unbearable cramps.
I didn't get any last night, as Nikki was having her Niagra Falls.
by Chesty LaRue November 2, 2003
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When you’re turned on so much it makes you incredibly wet, so wet as to compare it to Niagara Falls, you know, if it was vagina size.
My hubby is so f#@king sexy, all he has to do is give me that look and my pussy gets wet like Niagara Falls!
by It’s Petra August 12, 2018
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when one throws-up. Prone to happen after pregaming with appletinis.

Phrase originated in a Boston pizza in Niagara Falls, ON.
Jeremy is such a toolbox, he did his niagara falls impression all over Boston Pizza, ruining all his single friends chances with those ladies.

(Text): Ass-clown wake up for class! or are you too tired from showing everyone your niagara falls impression last night?
by Ryan and Jeremy September 30, 2007
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When a girl does something or sees something that makes her vagina get extremely wet
Chris: Madi, why do you look like you peed your pants?

Madi: Well you walked into the room and I got Niagara Falls Syndrome!

Chris: That happens all the time!
by Mizfku December 15, 2010
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(n.) this is the result of either eating too much spicy food, having a flu, or getting anally penetrated too hard and/or rapidly. A massive eruption of defecation occurs where shit falls uncontrollably from the asshole. Anywhere from 6 to 65lbs of shit can leave the body.
After anally raping his boyfriend, Glenn pulled out his big jagged dick so fast from Tucker's ass, that Tucker experienced the Niagara Falls of Shit.
by jaaaraaaahhhhhhhhhddd August 28, 2009
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Niagara Falls does mean a waterfall or city. But it also means a girls period. It is tycially used for girls to talk about among each other without others knowing. It is a nickname for period because for some it might feel like Niagara Falls is coming out of them. Note that you don't say the word period. Just Niagra falls.
"UGHHH that assembly was terrible"

"I know right and I'm on Niagara Falls (period)! So when I finally stood up-"

"I don't need any details."
by Ihavenolife April 12, 2014
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A once elegant very wealthy and sophisticated city, with a famous waterfall, now run into the ground by ignorance, politics and false hope. Pictures today of Falls Street, Main Street, Fourth Street, Park Place and Buffalo Avenue compared to 1880 tell the entire story.
Your family lives in Niagara Falls, NY still? No, we lived in Niagara Falls, thank you.
by NortheastTST July 3, 2013
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